code: def testRegression(self):
      signal = numpy.sin(
          numpy.arange(1024, dtype="f4") / 1024.0 * 441 * 2 * math.pi
      )
      self.assertAlmostEqualVector(
          signal * len(signal),
          IFFT(normalize=False)(FFT()(signal)),
          1e-2,
      )
  
file_path: essentia/test/src/unittests/standard/test_ifft.py
imports: from essentia_test import *
  import math
label_desc: Use image node_id 5 for calling the TestIFFT obj's underlying member method code with example usage: obj.testRegression() without return types